Osa (handgun) - Variants

Variants

• PB-4 "OSA" (ПБ-4 "ОСА") - first model, 18×45 mm cartridge, production started in 1999
• PB-4M (ПБ-4М) - second model, 18×45 mm cartridge, production started in 2002
• PB-4-1 (ПБ-4-1) - model with built-in laser sight, 18×45 mm cartridge, production started in 2003
• PB-4-1ML (ПБ-4-1МЛ) - new model with built-in laser sight, 18×45 mm cartridge, production started in 2005
• PB-4-2 (ПБ-4-2) - new model, 18.5×55 mm cartridge
• PB-4SP (ПБ-4СП) - "service model", 18.5×60 mm cartridge, in 2005 adopted by Ministry of the Interior of the Russian Federation as service weapon for several categories of Russian law enforcement (Moscow Metropolitan post and patrol Militia unit, etc.).